At least 20 to 30 minutes of sunlight exposure 3 times per week should provide enough vitamin
a. a
b. c
c. d
d. k reset selection

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.